diff --git a/web/cashtab/src/components/Send/Send.js b/web/cashtab/src/components/Send/Send.js
--- a/web/cashtab/src/components/Send/Send.js
+++ b/web/cashtab/src/components/Send/Send.js
@@ -22,7 +22,7 @@
     toLegacy,
 } from '@components/Common/Ticker.js';
 import { Event } from '@utils/GoogleAnalytics';
-import { shouldRejectAmountInput } from '@utils/validation';
+import { fiatToCrypto, shouldRejectAmountInput } from '@utils/validation';
 export const BalanceHeader = styled.div`
     p {
         color: #777;
@@ -209,7 +209,7 @@
         let bchValue = value;
 
         if (selectedCurrency === 'USD') {
-            bchValue = (value / fiatPrice).toFixed(8);
+            bchValue = fiatToCrypto(value, fiatPrice);
         }
 
         try {
@@ -379,9 +379,9 @@
                 2,
             )} USD`;
         } else {
-            fiatPriceString = `${(Number(formData.value) / fiatPrice).toFixed(
-                8,
-            )} ${currency.ticker}`;
+            fiatPriceString = `${
+                formData.value ? fiatToCrypto(formData.value, fiatPrice) : '0'
+            } ${currency.ticker}`;
         }
     }
 
diff --git a/web/cashtab/src/utils/__tests__/validation.test.js b/web/cashtab/src/utils/__tests__/validation.test.js
--- a/web/cashtab/src/utils/__tests__/validation.test.js
+++ b/web/cashtab/src/utils/__tests__/validation.test.js
@@ -1,4 +1,4 @@
-import { shouldRejectAmountInput } from '../validation';
+import { shouldRejectAmountInput, fiatToCrypto } from '../validation';
 import { currency } from '@components/Common/Ticker.js';
 
 describe('Validation utils', () => {
@@ -71,4 +71,12 @@
             shouldRejectAmountInput('17.123456789', currency.ticker, 20.0, 35),
         ).toBe(expectedValidationError);
     });
+    it(`Returns expected crypto amount with 8 decimals of precision even if inputs have higher precision`, () => {
+        expect(fiatToCrypto('10.97231694823432', 20.3231342349234234)).toBe(
+            '0.53989295',
+        );
+    });
+    it(`Returns expected crypto amount with 8 decimals of precision even if inputs have lower precision`, () => {
+        expect(fiatToCrypto('10.94', 10)).toBe('1.09400000');
+    });
 });
diff --git a/web/cashtab/src/utils/validation.js b/web/cashtab/src/utils/validation.js
--- a/web/cashtab/src/utils/validation.js
+++ b/web/cashtab/src/utils/validation.js
@@ -1,3 +1,4 @@
+import BigNumber from 'bignumber.js';
 import { currency } from '@components/Common/Ticker.js';
 
 // Validate cash amount
@@ -9,20 +10,21 @@
 ) => {
     // Take cashAmount as input, a string from form input
     let error = false;
-    let testedAmount = cashAmount;
+    let testedAmount = new BigNumber(cashAmount);
 
     if (selectedCurrency === 'USD') {
-        testedAmount = (cashAmount / fiatPrice).toFixed(8);
+        // Ensure no more than 8 decimal places
+        testedAmount = new BigNumber(fiatToCrypto(cashAmount, fiatPrice));
     }
 
     // Validate value for > 0
     if (isNaN(testedAmount)) {
         error = 'Amount must be a number';
-    } else if (testedAmount <= 0) {
+    } else if (testedAmount.lte(0)) {
         error = 'Amount must be greater than 0';
-    } else if (testedAmount < currency.dust) {
+    } else if (testedAmount.lt(currency.dust)) {
         error = `Send amount must be at least ${currency.dust} ${currency.ticker}`;
-    } else if (testedAmount > totalCashBalance) {
+    } else if (testedAmount.gt(totalCashBalance)) {
         error = `Amount cannot exceed your ${currency.ticker} balance`;
     } else if (!isNaN(testedAmount) && testedAmount.toString().includes('.')) {
         if (testedAmount.toString().split('.')[1].length > 8) {
@@ -32,3 +34,11 @@
     // return false if no error, or string error msg if error
     return error;
 };
+
+export const fiatToCrypto = (fiatAmount, fiatPrice) => {
+    // Return a string with no more than 8 decimal places
+    let cryptoAmount = new BigNumber(fiatAmount)
+        .div(new BigNumber(fiatPrice))
+        .toFixed(8);
+    return cryptoAmount;
+};