This chart is the Mother of All Charts for Sagitta measurements. The horizontal direction is the mirror size in inches from 3" to 25", the vertical direction is the focal length from 22" to 150". The values at the intersections between the two directions are the sagitta value for that diameter mirror and that focal length. Please note that the ROC of the surface is twice the focal length indicated!

The chart for drill sizes is in this chart.

XXX345678 9101112131415 16171819202122 232425
220.025580.045480.071080.102390.139430.182200.230720.285010.345100.411010.482760.560390.643920.733380.828830.930291.037811.151431.271201.397181.529421.667981.81292
240.023440.041680.065150.093840.127770.166960.211400.261130.316150.376480.442140.513160.589560.671360.758600.851300.949501.053221.162521.277411.397961.524201.65618
260.021640.038480.060130.086610.117920.154070.195080.240940.291680.347310.407850.473310.543710.619070.699420.784770.875150.970601.071131.176781.287581.403561.52476
280.020090.035730.055830.080410.109480.143040.181100.223660.270740.322360.378510.439220.504500.574370.648850.727950.811690.900090.993181.090981.193521.300821.41291
300.018750.033340.052110.075050.102170.133480.168990.208700.252620.300750.353120.409730.470600.535730.605130.678840.756860.839200.925891.016951.112401.212251.31653
320.017580.031260.048850.070350.095770.125120.158400.195610.236770.281870.330930.383960.440970.501970.566960.635970.709010.786080.867200.952401.041681.135071.23257
340.016550.029420.045970.066210.090130.117750.149060.184070.222790.265220.311370.361250.414870.472230.533340.598220.666870.739310.815550.895600.979481.067201.15877
360.015630.027780.043420.062530.085120.111200.140760.173820.210380.250440.294000.341090.391690.445820.503500.564710.629490.697830.769740.845240.924341.007041.09337
380.014800.026320.041130.059230.080630.105340.133340.164650.199270.237210.278470.323060.370970.422230.476820.534780.596090.660770.728820.800270.875100.953351.03501
400.014060.025000.039070.056270.076600.100060.126660.156400.189290.225320.264500.306840.352340.401010.452840.507860.566070.627460.692060.759860.830880.905120.98260
420.013390.023810.037210.053590.072950.095290.120620.148940.180250.214560.251870.292170.335490.381820.431170.483530.538930.597360.658830.723350.790930.861560.93527
440.012790.022730.035520.051150.069630.090960.115130.142160.172040.204780.240390.278850.320180.364390.411470.461440.514290.570030.628670.690210.754660.822020.89231
460.012230.021740.033970.048930.066600.087000.110120.135970.164550.195860.229910.266690.306220.348490.393500.441280.491800.545090.601150.659980.721580.785970.85314
480.011720.020840.032560.046890.063820.083370.105530.130300.157680.187680.220300.255550.293420.333910.377040.422810.471210.522250.575950.632290.691290.752950.81728
500.011250.020000.031250.045010.061270.080030.101300.125080.151360.180160.211470.245300.281650.320510.361900.405820.452270.501260.552780.606840.663450.722610.78433
520.010820.019230.030050.043280.058910.076950.097400.120260.145530.173220.203320.235840.270790.308150.347940.390150.434800.481890.531410.583370.637770.694630.75393
540.010420.018520.028940.041670.056730.074100.093790.115800.140140.166800.195780.227090.260730.296700.335010.375650.418640.463960.511630.561650.614010.668740.72582
560.010050.017860.027910.040190.054700.071450.090440.111660.135130.160830.188780.218960.251400.286080.323010.362190.403630.447320.493270.541490.591970.644710.69973
580.009700.017240.026940.038800.052810.068990.087320.107810.130460.155280.182260.211400.242710.276190.311840.349660.389660.431840.476190.522730.571450.622360.67546
600.009380.016670.026040.037510.051050.066690.084400.104210.126110.150090.176170.204340.234600.266960.301420.337980.376630.417390.460260.505230.552310.601510.65282
620.009070.016130.025200.036300.049410.064530.081680.100850.122040.145250.170480.197740.227020.258330.291670.327040.364450.403880.445360.488870.534420.582010.63165
640.008790.015630.024420.035160.047860.062520.079130.097690.118220.140700.165150.191550.219920.250240.282540.316800.353030.391220.431390.473530.517650.563740.61181
660.008520.015150.023680.034100.046410.060620.076730.094730.114630.136430.160140.185740.213240.242650.273960.307180.342300.379330.418280.459130.501900.546590.59319
680.008270.014710.022980.033090.045040.058840.074470.091940.111260.132420.155420.180270.206960.235500.265880.298120.332210.368150.405940.445580.487090.530450.57567
700.008040.014290.022320.032150.043760.057150.072340.089310.108080.128630.150970.175110.201040.228760.258270.289590.322690.357600.394310.432810.473120.515230.55915
720.007810.013890.021700.031250.042540.055570.070330.086830.105070.125050.146780.170240.195450.222390.251090.281530.313710.347640.383320.420750.459940.500870.54356
740.007600.013510.021120.030410.041390.054060.068430.084480.102230.121670.142810.165630.190160.216370.244290.273900.305210.338220.372940.409350.447470.487290.52882
760.007400.013160.020560.029610.040300.052640.066630.082260.099540.118470.139040.161270.185150.210670.237850.266680.297170.329300.363100.398550.435660.474420.51485
780.007210.012820.020030.028850.039270.051290.064920.080150.096990.115430.135480.157130.180390.205260.231740.259830.289530.320840.353770.388300.424460.462220.50161
800.007030.012500.019530.028130.038290.050010.063290.078140.094560.112540.132090.153200.175880.200130.225940.253330.282280.312810.344900.378570.413820.450630.48903
820.006860.012200.019060.027440.037350.048790.061750.076240.092250.109790.128860.149460.171580.195240.220420.247140.275380.305160.336470.369320.403700.439610.47707
840.006700.011910.018600.026790.036460.047630.060280.074420.090050.107180.125790.145900.167490.190580.215170.241240.268820.297880.328450.360510.394060.429120.46568
860.006540.011630.018170.026160.035610.046520.058880.072690.087960.104680.122860.142500.163600.186150.210160.235630.262560.290940.320790.352100.384880.419120.45482
880.006390.011360.017760.025570.034800.045460.057540.071040.085960.102300.120070.139260.159870.181910.205380.230260.256580.284320.313490.344090.376110.409570.44445
900.006250.011110.017360.025000.034030.044450.056260.069460.084050.100030.117400.136160.156320.177870.200810.225140.250870.277990.306510.336430.367740.400450.43455
920.006110.010870.016980.024460.033290.043480.055040.067950.082220.097850.114850.133200.152920.174000.196440.220240.245410.271940.299840.329100.359730.391720.42508
940.005980.010640.016620.023940.032580.042560.053860.066500.080470.095770.112400.130360.149660.170290.192250.215550.240180.266150.293450.322080.352060.383370.41602
960.005860.010420.016280.023440.031900.041670.052740.065120.078790.093770.110060.127650.146540.166740.188240.211050.235170.260590.287320.315360.344710.375370.40733
980.005740.010200.015940.022960.031250.040820.051660.063790.077180.091860.107810.125040.143550.163330.184400.206740.230360.255270.281450.308920.337660.367690.39900
1000.005630.010000.01563 0.022500.030630.040000.050630.062510.075640.090020.105650.122540.140670.160060.180710.202600.225750.250160.275820.302730.330900.360320.39101
1020.005510.009800.01532 0.022060.030030.039220.049640.061280.074160.088250.103580.120130.137910.156920.177160.198630.221320.245250.270400.296780.324400.353250.38333
1040.005410.009620.01502 0.021640.029450.038470.048680.060100.072730.086560.101590.117820.135260.153900.173750.194800.217060.240520.265190.291070.318150.346440.37594
1060.005310.009430.01474 0.021230.028890.037740.047760.058970.071360.084920.099670.115600.132710.151000.170470.191120.212960.235980.260180.285570.312140.339900.36883
1080.005210.009260.01447 0.020830.028360.037040.046880.057880.070030.083350.097820.113460.130250.148200.167310.187580.209010.231610.255360.280270.306350.333590.36199
1100.005110.009090.01421 0.020460.027840.036370.046030.056830.068760.081830.096040.111390.127880.145500.164270.184170.205210.227390.250710.275170.300770.327520.35540
1120.005020.008930.01395 0.020090.027350.035720.045210.055810.067530.080370.094330.109400.125590.142900.161330.180880.201540.223330.246230.270250.295400.321660.34904
1140.004930.008770.01371 0.019740.026870.035090.044410.054830.066350.078960.092670.107480.123390.140390.158500.177700.198000.219400.241900.265510.290210.316010.34291
1160.004850.008620.01347 0.019400.026400.034490.043650.053890.065200.077600.091070.105630.121260.137970.155760.174630.194590.215620.237730.260920.285200.310550.33699
1180.004770.008470.01324 0.019070.025950.033900.042910.052970.064100.076280.089530.103840.119200.135630.153120.171670.191290.211960.233700.256500.280360.305280.33127
1200.004690.008330.01302 0.018750.025520.033340.042190.052090.063030.075010.088040.102110.117220.133370.150570.168810.188090.208420.229800.252220.275680.300190.32574
1220.004610.008200.01281 0.018440.025100.032790.041500.05123 0.062000.073780.086590.100430.11529 0.131180.148100.166040.185010.20500 0.226030.248080.271150.295260.32039
1240.004540.008060.01260 0.018150.024700.032260.040830.050410.061000.072590.085200.098810.113430.129070.145710.163360.182020.201690.222380.244070.266780.290490.31522
1260.004460.007940.01240 0.017860.024310.031750.040180.049610.060030.071440.083840.097240.111630.127020.143390.160770.179130.198490.218850.240190.262540.285880.31021
1280.004390.007810.01221 0.017580.023930.031250.039550.048830.059090.070320.082530.095720.109890.125030.141150.158250.176330.195390.215420.236440.258430.281400.30536
1300.004330.007690.01202 0.017310.023560.030770.038950.048080.058180.069240.081260.094250.108200.123110.138980.155820.173620.192380.212110.232800.254450.277070.30065
1320.004260.007580.01184 0.017050.023200.030300.038360.047350.057300.068190.080030.092820.106560.121240.136870.153450.170980.189460.208890.229270.250590.272870.29609
1340.004200.007460.01166 0.016790.022860.029850.037780.046650.056440.067170.078840.091430.104960.119430.134830.151160.168430.186630.205770.225840.246850.268790.29167
1360.004140.007350.01149 0.016540.022520.029410.037230.045960.055610.066180.077680.090090.103420.117670.132840.148940.165950.183890.202740.222520.243220.264830.28738
1390.004080.007250.01132 0.016300.022190.028990.036690.045290.054810.065230.076550.088780.101920.115970.130920.146780.163540.181220.199800.219290.239690.260990.28321
1400.004020.007140.01116 0.016070.021880.028570.036160.044650.054020.064290.075460.087510.100460.114310.129050.144680.161210.178630.196940.216150.236260.257260.27916
1420.003960.007040.01100 0.015850.021570.028170.035650.044020.053260.063390.074390.086280.099050.112700.127230.142640.158940.176110.194170.213110.232930.253630.27522
1440.003910.006940.01085 0.015630.021270.027780.035160.043410.052520.062510.073360.085080.097670.111130.125460.140660.156730.173660.191470.210150.229690.250110.27140
1460.003850.006850.01070 0.015410.020980.027400.034680.042810.051800.061650.072350.083920.096330.109610.123740.138730.154580.171280.188850.207270.226540.246680.26767
1480.003800.006760.01056 0.015200.020690.027030.034210.042230.051100.060820.071380.082780.095030.108130.122070.136860.152490.168970.186290.204460.223480.243340.26405
1500.003750.006670.01042 0.015000.020420.026670.033750.041670.050420.060010.070420.081680.093760.106690.120440.135030.150450.166710.183810.201730.220500.240100.26053

This chart is much wider than you can print directly from this page. The best thing to do is to capture the desired numbers into a word processor and print from there. In landscape mode of printing you should be able to print to the 19" set of numbers if you put the margins at .5" and use the smallest size of font with the text size option.
You may also save the source code for the page and edit from there if so desired. Finding just the ROC range is the easy way to delete large parts of the code and the rest becomes a lot easier to check and delete. Columns are harder to delete than rows across are due to the way that tables are done with HTML.

Good luck and enjoy the chart!